Flow regulator



FIG. 1 is a rear perspective view of a flow regulator according to our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a front elevational view thereof.

The dashed lines in the views form no part of the claimed design. 

The ornamental design for a flow regulator, as shown and described. 